中文摘要：

太湖流域洪水灾害日趋频繁、洪灾损失越来越大.针对太湖流域河网水系复杂等特点,本文将流域分为山区和平原区,分别构建分布式水文模型VIC和水力学模型ISIS.其中,上游山区划分为9个子流域,19个流量节点,构建了太湖流域山区分布式VIC水文模型,为平原区ISIS模型提供山区边界入流;平原区河网概化为795条河道和2 394个河道断面植入ISIS模型.选取1999年大洪水为典型,对所建水文-水力学耦合模型进行验证.结果表明：VIC模型在上游山区适用性较好,湖西和浙西山区总水量的模拟相对误差分别为9.73%和-11.18%,N-S效率系数达到0.81和0.72,ISIS模型模拟的6个站点汛期最高水位与实测值的绝对误差大多控制在±10cm以内,模拟的各站峰现时间也与实测值基本吻合,平均误差为2d,基本可以满足平原河网地区洪水模拟的精度要求.

英文摘要：

Focused on the increasing frequency and magnitude of floods in the Taihu basin characterized by complicated river networks,a hydro-dynamical system was developed for the purpose of flood simulation,which consisted of a distributed hydrological model VIC for upland runoff simulation and a hydraulic model ISIS for floodplain inundation simulation.The mountain area was divided into 9 sub-catchments splitting into 19 boundary nodes as upland inflows into floodplain,while a conceptualized river network was proposed in this study for the ISIS model in the floodplain,which consisted of 795 reaches and 2394 river cross sections.The coupled system was verified by the observed 1999 flood.Results showed that the relative errors（Er） of the annual average runoff at Hengtangcun hydrological station were 0.77% and 3.43%,respectively and the coefficient of determination and Nash-Suttcliffe efficiency coefficient were both greater than 0.75,implying that the VIC model was suitable for the upland hydrological simulation.The maximum water levels at six stations simulated by the ISIS model were consistent with observed values,with absolute errors ranging from-10 to ＋10 cm.Simulated peak time at six stations also fitted well with observed values,with an average error up to two days,implying that the coupled system could be used for flood simulation in plain areas with complex river networks.